Open AccessPhase transition and vortex noise spectrum in two-dimensional Josephson-junction array
Author(s) -
Wu Bing-Guo,
Zhao Zhi-gang,
You Yu-Xin,
Mei Liu
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.1680
Subject(s) - josephson effect , vortex , physics , pi josephson junction , noise (video) , condensed matter physics , phase transition , phase (matter) , superconducting tunnel junction , superconductivity , quantum mechanics , computer science , artificial intelligence , image (mathematics) , thermodynamics
Using the resistively shunted junction (RSJ) modelwe calculate the temperature dependence of vorticities and fluctuations of vorticities in two-dimensional Josephson junction array (JJA). It is found that the phase transition is of the Berezinski-Kosterlitz-Thouless (KTB) type. We also study the temperature and driving current dependence of the noise power spectrum in the vicinity of phase transition. The calculated results are consistent with recent experimental reports, and the main characteristics of the noise power spectrum can be explained by the motion of vortices.